Function beginWork

code/event-handlers/public/app.js:9828–9871

(current, workInProgress, renderExpirationTime)

  }

  function beginWork(current, workInProgress, renderExpirationTime) {
    if (workInProgress.expirationTime === NoWork || workInProgress.expirationTime > renderExpirationTime) {
      return bailoutOnLowPriority(current, workInProgress);
    }

    switch (workInProgress.tag) {
      case IndeterminateComponent:
        return mountIndeterminateComponent(current, workInProgress, renderExpirationTime);
      case FunctionalComponent:
        return updateFunctionalComponent(current, workInProgress);
      case ClassComponent:
        return updateClassComponent(current, workInProgress, renderExpirationTime);
      case HostRoot:
        return updateHostRoot(current, workInProgress, renderExpirationTime);
      case HostComponent:
        return updateHostComponent(current, workInProgress, renderExpirationTime);
      case HostText:
        return updateHostText(current, workInProgress);
      case CallHandlerPhase:
        // This is a restart. Reset the tag to the initial phase.
        workInProgress.tag = CallComponent;
      // Intentionally fall through since this is now the same.
      case CallComponent:
        return updateCallComponent(current, workInProgress, renderExpirationTime);
      case ReturnComponent:
        // A return component is just a placeholder, we can just run through the
        // next one immediately.
        return null;
      case HostPortal:
        return updatePortalComponent(current, workInProgress, renderExpirationTime);
      case ForwardRef:
        return updateForwardRef(current, workInProgress);
      case Fragment:
        return updateFragment(current, workInProgress);
      case Mode:
        return updateMode(current, workInProgress);
      case ContextProvider:
        return updateContextProvider(current, workInProgress, renderExpirationTime);
      case ContextConsumer:
        return updateContextConsumer(current, workInProgress, renderExpirationTime);
      default:
        invariant(false, 'Unknown unit of work tag. This error is likely caused by a bug in React. Please file an issue.');
    }
  }

  return {
    beginWork: beginWork